The recipient a .ppt file in .dat in Outlook

How come a user1 send an email to user2 with .ppt attached and user2 recveives the email but with .dat file?

Is the anvirus on user desktop?
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It might be the antivirus on the desktop or the Exchange Server on the receiving end that is changing the extension. Couple of things to try:

Rename the file back to filename.ppt after receiving it.
Send it after zipping it with either Winzip or Winrar.
Send/Receive it through Yahoo or other similar email providers and vice versa.
Receive/open it on a different desktop if possible.

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Yes this may be due to Antivirus.
If you want to make sure abt this just disable antivirus and send the same mail.
Otherwise you can rename the file to .ppt after you receive it.
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